Double-action pump



Dec. 19,- 1950 G. D. GIBSON DOUBLE-ACTION PUMP Filed May 13, 1948 IG. F2

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GLENN DEAN GIBSON ATTORNEYS avery short-stroke, a

communicating respectively with the lower end of the passage 5d and thelower end of the lower cylinder 5b. Passages Ma and MD are providedadjacent their lower ends with annular valve seats 14c and hidrespectively, which are cooperatively associated with ball valves l5 andI6 disposed thereabove. A small chamber Me is formed in block l4 belowpassages Ma and Mb which is closed at its lower end save forcommunication through a nipple [4 with the liquid supply therebelow.

Casing 5 is closed at its upper end by a combined closure and dischargemember indicated as an entirety by the numeral l1, comprising ahorizontal plate Ila having integrally cast or otherwise afiixedthereto, a branch discharge fitting I'Ib having a branch connected withthe upper end of cylinder 5a and another branch ex- I tending axially ofand connected with the upper-- end of the upper passage 50.

The rack bars 9 and I2 are interconnected for joint operation inopposite directions by apinion or spur gear [8 which is revolublyjourn'aled on a pivot shaft [9 which extends through a closure plug atone side of the casing and through an aperture formed in the oppositeside of the casing. Plug 20 is of a diameter slightly greater than thepinion l'8 to facilitate assembly of the In use, when the pump rod I3 isreciprocated, pistons B and ID are moved in opposite directions withintheir respective cylinders 5a and 5]). Re-

ciprocating power is directly applied to piston l0 through the rack bar.I 2 and is transmittedoppositely to piston 6 through the pinion l8 andrack bar -9. The rack bars 9 and [2 are precisely guided forlongitudinal reciprocating movement by means of vertical channel guides24 and 25 respectively, cast or otherwise formed on the medial portionsof the side walls of housing 5. As shown, these channels are formed ininwardly extending lugs which preferably are apertured to permit freepassage of liquid through the bodies thereof.

In the upward movement of each of the pistons '5 and II], the ballvalves 1 and H are closed and sealed against their respective seats andthe-action of the piston lifts the water above it, upwardly, while atthe same time by suction, drawing water through the intake passages Maand Nb as the case may be. In the downward strokes of pistons B and 10,the ball valves 1 and H are dislodged upwardly from their seats andcheck valves I 5 and It in the intake of the housing, are

closed.

It will be apparent that as piston 6 is moving upwardly in its cylinder5a in the pumping stroke, the piston IE! is moving downwardly throughthe liquid contained in cylinder 5b. The result is that an almostcontinuous uniform discharge of liquid through pipe P is effected evenwhen the pump rod I3 is reciprocated through to withstand long continueduse. .operation of reciprocating piston parts, rack The overlappingrelationship of the paths of the two pistons 6 and I0 and theirassociated cylinders brings about an application of power throughreciprocation of rod l3 axially of piston l0 and offset only a shortdistance from the longitudinal axis of piston 6. Furthermore, sucharrangement enables my structure and the working parts thereof to bevery closely compacted into a small unitary structure.

The entire mechanism may be very quickly assembled in a unitary housing;comprises a minimum number of working parts and is adapted The cobarsand efiicient ball valves provides a high capacity, double acting pumpwherein the valves are nicely sealed in their cycles of operation.

It will of course, be understood that various changes may be made in theform, details, arrangement and proportions of the parts withoutdeparting from the scope of my invention.

What I claim is:

1. A double acting pump comprising a unitary housing having a pair ofcylinders formed therein, disposed with their axes in parallel relation,one of said cylinders being located adjacent one end of said housing andthe other of said cylinders being located adjacent the opposite end ofsaid housing, said casing having a discharge passage communicating withthe delivery ends of said cylinders and having an intake passagecommunicating through branches with the intake ends of said cylinders,check valves disposed in the branches of said intake passage, pistonsmounted for reciprocation in said cylinders and each having aliquidpassage therethrough and a valve adapted to close said passage when thepiston is moved towards the discharge end of its stroke, means extendingbeyond said housing for reciprocating one of said pistons and meansmounted in said housing for interconnecting said pistons to drive saidpistons in opposite directions, the inner ends of said cylinders beingspaced apart in a direction longitudinally of said housing and said lastmentioned means comprising-a pinioninterposed in said housing betweenthe inner ends of said cylinders and longitudinal rack bars connectedwith each of said pistons and intermeshed with said pinion.

2. A double acting pump comprising a unitary housing having a pair ofcylinders longitudinally formed therein and disposed with their axes inparallel relation but with their circumferences in overlapping relation,one of said cylinders being located adjacent one end of said housing andthe other of said cylinders being located adjacent the opposite end ofsaid housing the inner ends of said cylinders being spaced a shortdismounted for reciprocation in said cylinders and each having a liquidpassage therethrough and valve adapted to close said passage when thepiston is moved towards the discharge end of its stroke, each of saidpistons having a rack bar connected therewith, said rack bars beingdisposed in parallel relation with racks opposed and a inion mountedwithin said housing and interposed between the inner ends of saidcylinders for interconnecting said rack bars to drive said pistons inopposite directions.

3. The structure set forth in claim 2 and means connected with one ofsaid pistons for connection with a reciprocating rod extending beyondsaid housing to actuate said pistons.

4. A double acting pump comprising a casing having a pair of cylindersformed therein, with their axes in parallel relation but with theircircumferences in overlapping relation, said casing having a dischargepassage communicating with the delivery ends of said cylinders andhaving an intake passage communicating with the intake ends of saidcylinders, pistons mounted for reciprocation in said cylinders and eachhaving a liquid passage therethrough and a valve adapted to close saidpassage when the piston is moved towards the discharge end of itsstroke, a pinion mounted medially of said casing within the same, withportions of its periphery exposed in said respective cylinders, a rackbar connected with one of said pistons and extending generally axiallythereof and in mesh with one side of said pinion, an oppositelyextending rack bar connected with the other of said pistons andextending generally axially thereof and being in mesh with the oppositeportion of the periphery of said pinion, a reciprocable actuating rodconnected with one of said rack bars, and check valves in the intakepassages of said cylinder.

5. A double acting pump comprising a housing having a pair of cylinderstherein disposed with their axes in parallel relation but with theircircumferences in overlapping relation, one of cylinders being disposedadjacent one end of said housing and the other of said cylinders beingdisposed adjacent the opposite end of said housing, said casing having adischarge passage communicating with the delivery end of said cylindersand having an intake passage communicating with the intake ends of saidcylinders, pistons mounted for reciprocation in said cylinders and eachhaving a liquid passage therethrough and a valve adapted to close saidpassage when the piston is moved towards the discharge end of itsstroke, each of said pistons having a rack bar connected therewith, saidrack bars being disposed in parallel relation with racks opposed and apinion journaled intermediately of the ends of said rack bars andintermeshed with the racks thereof for interconnecting said rack bars todrive said pistons in opposite directions.

GLENN DEAN GIBSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 141,807 Morrell et a1. Aug. 12,1873 1,896,445 Gibson Feb. 7, 1933

